How to make a LinkedIn banner your profile photo doesn’t cover
A free tool that makes a 1584×396 LinkedIn banner and marks the corner your profile photo sits on, so your words land where visitors can read them.
Lab guides
Every free tool in the John King Lab, with a guide to what it does and how to get the most from it.
Open the LabIs your LinkedIn content mix working? Check your last 20 posts
Paste your LinkedIn profile and see what your last 20 posts are doing for you: which bring in readers, which build trust, which sell, and who they reach.
How to write a LinkedIn headline that says who you help
Paste your LinkedIn headline and get five rewrites that say who you help, the outcome you get them and how, all within the 220-character limit.
Your best LinkedIn hook is already in your draft. Here’s how to find it
Hook finder scores every line of your LinkedIn draft as an opener, moves the strongest one to the top and leaves the rest of your words as you wrote them.
Four ways to open a LinkedIn post, scored before you publish
Turn a post idea into four LinkedIn opening lines, each a different kind of hook, scored out of 100 so you know which one stops the scroll.
Bold and italics on LinkedIn, and where "…see more" really cuts your post
Write with bold, italics and lists and get them back in characters LinkedIn displays, with the real "…see more" cut-off on phone, tablet and desktop.
Email deliverability
Is your sending domain on a blacklist? Check the lists inboxes actually read
Check your sending domain and IPs against Spamhaus, SURBL and Barracuda, the blacklists Gmail, Outlook and Yahoo consult, with removal steps for every listing.
SPF, DKIM and DMARC: check your email domain and get the exact fix
Check your SPF, DKIM, DMARC, MX records and blacklists the way receiving mail servers do, and get the exact DNS record that fixes each problem.
How many domains and mailboxes do you need for cold email?
Tell the calculator how many cold emails a day you want to send and get the domains, mailboxes and week-by-week warm-up it takes to get there safely.
Website & SEO
How to find a domain name that’s still available
Type your name ideas and see every domain you can still register, checked straight against the registry and ranked by how it sounds and reads.
Why your link preview looks wrong on LinkedIn, X and Slack, and how to fix it
Paste a URL and see the preview card LinkedIn, X, Slack and iMessage will draw for it, with a ready-to-paste block of corrected Open Graph and Twitter Card tags.
Which tracking pixels actually fire on your site? Audit them in one pass
See which analytics and ad tags actually fire on your page, which are broken or duplicated, and whether any of them leak personal data to ad networks.
AI
Does ChatGPT recommend your company? How to check your AI search visibility
Ask ChatGPT, Claude, Gemini and Perplexity who they recommend for what you sell, and see whether they name you, how high, and who they name instead.
Can AI search read your website? robots.txt, llms.txt and structured data checked
Find out whether ChatGPT, Claude, Perplexity and Google AI can read your site, and get ready-to-paste robots.txt lines, a starter llms.txt and JSON-LD to fix it.
Which AI model is best for your prompt? Compare them side by side
Run one prompt on several AI models at once and see the answers side by side, with how long each took, what it cost and the exact model version.
What does an AI voice agent cost per call compared with a person?
Enter your calls a month and how long they last, and see what an AI voice agent costs per call, per month and per year next to a person answering them.
Outbound & prospecting
Why your cold emails get ignored: a step-by-step teardown
Paste your cold email sequence and get a score for every step against the things that get cold email ignored, with the three gaps that cost you the most replies.
How to build an ideal customer profile from your best three customers
Describe the customers you would clone and get the titles, company traits and buying signals to find more like them, with search filters ready to paste.
Ten ways to pitch the same offer, ranked strongest first
Describe one offer and get ten ways to pitch it, by pain, outcome and proof, each with an opening line, ranked strongest first.
How to answer a reply to your cold email
Paste a reply to your cold email, see what kind of reply it really is and the words that gave it away, and get an answer written for it.
How to space an outreach sequence: a timeline you can check and export
Lay out your outreach steps, channels and waits on a real calendar, check the spacing for what makes people stop answering, and export it.
Content
How to write down your brand voice from five posts
Paste five posts you have written and get a written guide to how you sound: your tone, your words and how you build a sentence and a post.
How your email subject line looks in Gmail, Outlook and Apple Mail
See your subject line and preview text the way Gmail, Outlook and Apple Mail show them on desktop and phone, with cut-offs marked and three rewrites that fit.
How to turn a YouTube video into five LinkedIn posts in your voice
Paste a YouTube link and get five posts written in your voice, each pulled from one idea in the video and pointing back to the moment it came from.